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Boston Weather: 39.0°F | Fair

Weather: Sloppy Storm Saga

By Marek Zebrowski
Staff Meteorologist

Our spell of tranquil and seasonable January weather will be interrupted when a high pressure system moves off shore on Wednesday and a storm passes west of our area during Thursday. Ahead of it, southwesterly winds will bring enough warm air to change all precipitation to rain by daybreak on Thursday.

Unfortunately, this shot of mild air will be very short-lived. As the storm system deepens and intensifies over the Maritimes, it will pull some very frigid air toward the eastern two-thirds of the nation. Arrival of the arctic front in our area some time early on Friday may be heralded by a line of snow squalls or flurries; afterward, several days of very cold weather are to follow.

In the longer-range outlook, a clipper-type storm may zip by late in the weekend, bringing some light snow to our area by Monday.

Today: Mostly sunny early; high clouds increasing throughout the afternoon. Westerly winds turning to fresher southwesterly breezes. High 40F (5C).

Tonight: Partly to mostly cloudy with precipitation developing late. Because of marginally cold surface temperatures and evaporative cooling, some sleet and freezing rain are possible before dawn, especially outside the metropolitan area. Low in town, 34F (1C).

Tomorrow: Cloudy with periods of rain and showers. A few breaks in overcast are possible before dark. High 44F (7C).

Tomorrow night: Partly cloudy with a chance of snow squalls from west to east. Turning colder, with lows falling into the 20s (-5 to -3C ).

Friday and weekend outlook: Becoming clear and much colder, with the coldest weather of the season so far. Highs may reach only low 20s (-6 to -5C) and lows will plummet into the single digits with dangerous windchills caused by northwesterly gales.